Biocontrol and population dynamics of Fusarium spp. on wheat stubble in Argentina
Year: 2012
Type: article
Abstract: The biocontrol effect of C lonostachys rosea (strains 016 and 1457) on F usarium graminearum , F . avenaceum , F . verticillioides , F . langsethiae , F . poae , F . sporotrichioides , F . culmorum and M icrodochium nivale was evaluated on naturally infected wheat stalks exposed to field conditions for 180 days. Experiments were conducted at two locations in A rgentina, M arcos J uarez and R ío C uarto. Antagonists were applied as conidial suspensions at two inoculum levels. Pathogens were quantified by T aq M an real‐time q PCR . During the first year at M arcos J uarez, biocontrol was observed in one antagonist treatment for F . graminearum after 90 days (73% reduction) but after 180 days, the pathogen decreased to undetectable levels. During the second year, biocontrol was observed in three antagonist treatments for F . graminearum and F . avenaceum (68·3% and 98·9% DNA reduction, respectively, after 90 days). Fusarium verticillioides was not controlled at M arcos J uarez. At R ío C uarto, biocontrol effects were observed in several treatments at different intervals, with a mean DNA reduction of 88·7% for F . graminearum and F . avenaceum , and 100% reduction for F . verticillioides in two treatments after 180 days. Populations of F . avenaceum and F . verticillioides were stable; meanwhile, F . graminearum population levels varied during the first 90 days, and low levels were observed after 180 days. The other pathogens were not detected. The study showed that wheat stalks were important reservoirs for F . avenaceum and F . verticillioides populations but less favourable for F . graminearum survival. Clonostachys rosea (strain 1457) showed potential to reduce the F usarium spp. on wheat stalks.
Source: Plant Pathology
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2140317527